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金属矿山 ›› 2022, Vol. 51 ›› Issue (03): 51-56.

• 采矿工程 • 上一篇    下一篇

不同等级岩巷力学参数赋值与素喷支护效果评价

袁海平  叶晨旭  王文辉   

  1. 合肥工业大学土木与水利工程学院,安徽 合肥 230009
  • 出版日期:2022-03-15 发布日期:2022-04-01
  • 基金资助:
    国家自然科学基金项目(编号:51874112);安徽高校协同创新项目(编号:GXXT-2020-055)

Mechanical Parameter Assignment and Plain Shotcrete Support Effect Evaluation of Different Grade Rock Roadway

YUAN Haiping  YE Chenxu  WANG Wenhui   

  1. School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China
  • Online:2022-03-15 Published:2022-04-01

摘要: 优化支护设计和改善支护效果是新时代矿山发展的迫切要求,但目前金属矿山巷道支护设计规范欠缺,设计与施工方案主要依靠简单的经验公式,缺乏相应的理论基础。在HoekBrown强度准则和地质强度指标GSI的理论基础上,实现了岩体质量等级力学参数随机赋值,提出了支护效果安全系数计算方法,对不同等级岩巷素喷支护进行了数值模拟分析。将模型计算数据与大数据统计分析相结合,建立了不同岩体等级、不同支护厚度与支护效果最小安全系数的经验表达式。研究表明:基于强度理论对围岩力学参数自行赋值,结合数值模拟软件可分析岩巷支护效果;通过确认应力控制阈值,可绘制断面安全系数包络图,直观寻找支护体系薄弱点以便预先加固。研究成果为不同质量等级围岩的素喷支护效果安全性评估提供了一种有效方法,可供实际工程设计借鉴。

关键词: 金属矿山, Hoek Brown强度准则, 数值模拟, 岩体等级, 最小安全系数

Abstract: At the same time,optimizing support design and improving support effect are the urgent requirements of mine development in the new era.But at present,there is a lack of design specifications for roadway support in metal mines.The design and construction scheme mainly rely on simple empirical formulas and lack of corresponding theoretical basis.Based on the theory of HoekBrown strength criterion and geological strength index GSI,this paper realizes the random assignment of mechanical parameters of rock mass quality grade,innovatively puts forward the calculation method of safety factor of support effect,and carries out numerical simulation analysis of plain shotcrete support in different grades of rock roadway.Combining the model calculation data with big data statistical analysis,the empirical expressions of the minimum safety factor for different rock mass quality grades,different support parameters and support effects are established.The research results show that the rock roadway support effect can be analyzed based on the self assignment of surrounding rock mechanical parameters based on the strength theory and combined with the numerical simulation software,which is in good agreement with the engineering site.By confirming the stress control threshold,the section safety factor envelope can be drawn to visually find the weak points of the support system for pre reinforcement.The research results provide an effective method for the safety evaluation of plain shotcrete support effect of surrounding rock with different quality grades,which can be used for reference in practical engineering design.

Key words: metal mine,Hoek Brown strength criterion,numerical simulation,rock mass grade,minimum safety factor